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Patent US2504178A successfully refreshed from Google Patents.
US2504178A
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Electrical condenser
Assignee: Sprague Electric Co
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Filing: 1947-04-28
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Granted: 1950-04-18
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Expires: 1967-04-28
Abstract
No abstract record available.
Inventors
- 👤 Burnham John
- 👤 Gilbert E Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:55
CPC Classifications
H; H01; H01G; H01G9/00; C; C22; C22C; C22C14/00; H04; H04B; H04B15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1344752A
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US1684684A
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US1925307A
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US1935860A
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US2408910A
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US2377910A
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US2399082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |